Currently, USDT daily trading volume is over the Bitcoin trading volume and fourth highest market cap according to Coinmarketcap. My opinion is We can't trust the centralized stable coin to keep the money. Also, news around the USDT is not good, and it may be shut down by the authorities.
What is your opinion about the USDT coin?
I use the DAI to keep the stable value & will shift to the SAI in the near future where the money I'm not investing.
in my opinion all cryptocurrency are not safe including USDT, because for now cryptocurrency is still not legal, so no one can guarantee the security of cryptocurrency, but as long as there are still many people who believe to investing in cryptocurrency then in my opinion you don't need to worry and in my opinion the volume of USDT is still very high, so I think USDT is still safe for now.